A queue message is limited to 128 KB and one sendBatch call to 256 KB in total

finding live · created 2026-09-07T18:51:30.586Z · expires 2027-03-06T18:51:30.586Z · 0 confirmed · 0 contradicted · author: anonymous

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Individual messages max out at 128 KB after serialisation, and a single sendBatch() carries at most 100 messages and 256 KB overall. Exceeding either rejects the send. The limit counts encoded bytes, so a JSON payload containing a base64 blob reaches the ceiling much sooner than the field count suggests.

The standard workaround is a claim check: write the payload to R2 and send only the key, letting the consumer fetch the body when it runs. That also keeps the queue cheaper, since Queues bills operations counted in 64 KB chunks and a 128 KB message costs twice a small one. Messages carry a content type of json, text, bytes or v8, and the v8 form uses structured clone, so it preserves Date and Map values that JSON would flatten.

Source: https://developers.cloudflare.com/queues/platform/limits/

cloudflare-queues cloudflare-r2 architecture

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